．Silting for too ong a time can shorten one's lire．

　　D．Smoking too much can be harmful to heal．30．The researcers draw the conclusion on the effect of sedentary behavior by

　　．

　　A．making comparisons

　　B．istin8 figures

　　C．giving examples

　　．classifying facts

　　31．What dues Dr．Katzmarzyk think of sedentary ehavior?

　　A．It warns people to exercise 30 minutes a day．

　　B．It's a bad behavior worh considering seriously．

　　C．Sedentary behavior can lead to death at once．

　　D．Sedentary ehavior is good for desk job workers．32．According to Dr．Katzmarzyk, if you are sing all the time, you may _

　　．

　　A．phone your friends and talk aout your problem

　　B．put on weight quickly and ecome more inactive

　　C．want to have more sugar for your meals

　　D．fincl it hard to keep your blood glucose proper

　　29—32 CABD

　　较难题目特训：科普知识类

　　There are plenty of good reasons to buy organic products, but nutrition may not be one of them, suggests a new study, which found no difference in antioxidant (抗氧化剂) levels between organically and conventionally (常规地) grown onions, carrots, and potatoes.

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